Adsorption of guar gum and CMC on pyrite

Bicak, O., Ekmekci, Z., Bradshaw, D. J. and Harris, P. J. (2007). Adsorption of guar gum and CMC on pyrite. In: D. Bradshaw, Minerals Engineering: Reagents 2006 Conference. Reagents 2006 Conference, Cape Town, South Africa, (996-1002). 1 November 2006.


Author Bicak, O.
Ekmekci, Z.
Bradshaw, D. J.
Harris, P. J.
Title of paper Adsorption of guar gum and CMC on pyrite
Conference Paper Type Fully Published Paper
Conference name Reagents 2006 Conference
DOI 10.1016/j.mineng.2007.03.002
Conference location Cape Town, South Africa
Conference dates 1 November 2006
Proceedings title Minerals Engineering: Reagents 2006 Conference  (ERA 2012 Listed)    (ERA 2010 Rank A*)   Check publisher's open access policy
Journal name Minerals Engineering  (ERA 2012 Listed)    (ERA 2010 Rank A*)   Check publisher's open access policy
Editor D. Bradshaw
Place published Oxford, Eng
Publisher Pergamon Press; Elsevier
Publication date 2007
Volume number 20
Issue number 10
ISSN 0892-6875
Start page 996
End page 1002
Total pages 7
Language eng
Abstract/Summary The depression of pyrite in sulfide flotation by two types of polysaccharides, CMC and guar, was investigated using micro-flotation tests, zeta potential measurements and adsorption tests. Environmentally and from an occupational safety standpoint – this would be a better processing option than cyanide. The range of variables tested included molecular weight of guar, degree of substitution of CMC,pH and the concentration of calcium ions in the flotation process water. The guar gums depressed pyrite considerably even at low dosages. An optimum dosage of 10 ppm was recommended. The CMC’s were not as effective as the guar gums, and required much higher dosages to achieve pyrite depression. Within the range of CMC’s tested, lower degree of substitution was more effective than high degree of substitution. This was presumably due to lower electrostatic repulsion between the negatively charged CMC and pyrite. When calcium ions were introduced with CMC’s, the adsorption of the CMC was considerably enhanced. No such effect was observed for guar gums.Both CMC and guar gums demonstrated Langmuirian behavior in their adsorption isotherms. Two different adsorption mechanisms were displayed. The guar gum adsorption was attributed to hydrogen bonding and Bronsted acid–base interaction. The CMC was considered to occur through electrostatic interaction in the presence of calcium ions, and Bronsted acid–base interaction depending on pH.
Subjects 290701 Mining Engineering
Keyword Sulphate ores
Flotation depressents
Adsorption
Polysaccharides
Q-Index Code E1

Document type: Conference Paper
Sub-type: Fully Published Paper
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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